18_+Maloof_Seeds_Outline - Lecture 18 Plant Lecture 5 Seed...

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1) By several measures the seed plants are the most successful plants on the planet. How? Lets look at some unique features. 2) One feature is the seed a) What is a seed? i) Contents (1) Contains a mature embryo; essentially a baby plant. Contains nutritive tissue to help that baby plant get started (2) Contains a protective seed coat from the previous sporophyte. b) Importance for plants i) Dispersal mechanism for the next sporophyte generation ii) Protection iii) Dormancy. c) Importance for humans i) We have already discussed that with the exception of seafood we are getting all of are calories from plants ii) We get the vast majority of our calories from seeds: d) How do seeds develop? i) The best way to do this will be to compare the life cycles of a heterosporous plant without seeds, such as selaginella to that of a seed plant, such as pine. (1) In Selaginella, the sporophyte is the dominant generation. (a) As you saw in lab these plants develop a strobilius or cone that contains sporangia, where the spores develop. (b) Lets focus on the megasporangium. Here haploid megaspores are produced through meiosis. The megaspore is released and then develops independently of the sporophyte. (c)
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This note was uploaded on 03/09/2011 for the course BIS 2 taught by Professor Coolprof during the Spring '11 term at Bank Street College of Education.

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18_+Maloof_Seeds_Outline - Lecture 18 Plant Lecture 5 Seed...

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